MO-WOA-GRA-TOPSIS integrated framework for thermo-hydrodynamic optimization of supercritical n-decane in aerospace corrugated cooling systems

This study proposes a novel MO-WOA-GRA-TOPSIS integrated framework for multi-objective thermo-hydrodynamic optimization of supercritical n-decane in aerospace corrugated cooling systems. Five critical design parameters (corrugation pitch, height, fillet radius , pressure, and mass flow rate) were systematically analyzed to balance heat transfer efficiency, flow resistance, and thermal stability. Quadratic response surface models were developed for Nusselt number ( Nu ), friction factor ( f ), and average temperature fluctuation coefficient ( ΔC ). Grey relational analysis identified dimensionless corrugation height ( R/D ) as the dominant factor for Nu (26.73 %) and f (24.62 %), while mass flow rate (q m ) primarily influenced ΔC (21.88 %). The proposed framework outperformed conventional NSGA-II in convergence speed and Pareto front uniformity. Pareto-optimal solutions achieved 46.2 % Nu enhancement and 19.7 % f reduction while maintaining ΔC within 0.5, demonstrating superior thermal management for next-generation aero-engine cooling systems.